I'm a librarian who loves anime, manga, and reading a wide variety of genres.
"'[...] I'm probably interpreting things the way I want them to be, but one thing's for sure: Miku used to really care about me.'
Juhachi nodded. 'If that were coming from some arrogant pick-up artist, things would be different...but since it's pure, innocent Asano, I think what he said is probably true.'
'Asano isn't the type to be vain and show off when it comes to romance,' Aika-san agreed."
Because "nice guys" who've never really dated before never misinterpret girls' feelings and assume they're more interested than they really are.
Yeah, Miku definitely likes Asano because that's the kind of book this is, but this particular passage has so many problems with it.